To do well in this course you should do the pre-class readings, attend lectures, do the warm-up problems, do the homeworks, attend office hours, discuss the material with your peers (eg when working on the homework with your partner).
As the term closes in and you have a lot of work, it's tempting to skip meals or sleep less. Don't do this. It's impossible to do math or write bug-free computer programs if you are too tired. If you can't finish everything and you are getting behind despite studying frantically, you may need to reduce your load: speak to your instructors and/or advisor.
This is a hard class. Even if you have never needed help in the past, you may need it this term. Do not be shy about coming into office hours or asking questions (e.g. in lecture, on Piazza). That's why they exist.
The course staff don't bite. We remember when we took hard math classes and needed help ourselves.
Don't worry that your question might be stupid. We don't admit stupid people. Probably a whole bunch of other people also have the same question and will appreciate the fact that you asked it.
Some parts of the assigned work must be done on your own. However, study groups can be extremely helpful for everything else. Your classmates can help you find mathematical bugs and, just as important, give you social support. Get to know the other students.
You have unlimited attempts for warm-up problems, but you won't learn much from the assignment if you just brute force all possible answers. It's almost impossible to get a good understanding of the material (and do well on the exams) without getting your hands dirty trying to work problems yourself.
Do not leave warm-up or homework problems until the last minute. Math problems are much easier to solve if you have time to think about them. Also, starting too late may limit your chances to get help from the course staff.
On the Exams page, you'll find a skills list for each exam. Use the skills list to help study for the exam.